Use arrow keys, and wasd to move. Click to attack. Pickup health potions to use to stay alive. Hold space to block, attacking while blocking pushes and stuns enemies instead of dealing damage to them. Use health potions to heal. Use numbers to switch through your inventory, F to use your career skill. If you have a ranged weapon, click 2 to switch to it. For the Stormcaller if the bar in the middle of your screen fills up you get struck by lightning.
Vermintide is a game that you're probably not old enough to play. lol